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TUBE EXPANDER.

Patented July 24, 1888.

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(No Model.)

W. H. TEBEAU 82; M. N. DE LONG.

sure STATES ATENT cares.

XVILLIAM H. TEBEAU AND MARSHALL N. DE LONG, OF SYRACUSE, NE\V YORK, ASSIGNORS OF ONE-FOURTH TO JACOB F. BENTZ,

OF SA ME PLACE.

TUBE-EXPANDER.

SPECIFICATION forming part of Letters Patent No. 386,728, dated July 24, 1898.

Serial No. 248,008. (No model.)

To aZZ whont it may concern.-

Be it known that we, XVILLIAM H. TEBEAU and llIARSHALL N. DE LONG, respectively of Syracuse, county of Onondaga, in the State of New York, and citizens of the United States, haveinvented certain new and useful Improvements in Tube Expanders, of which the fol lowing is a specification, reference being had to the accompanying drawings.

This invention relates to the class of tubeexpanders in which two or more rollers are supported rotarily and movable laterally in a su itable head or body adapted to be introduced in the end of the tube to be expanded, and a tapering mandrel is inserted between the rollers to push them outward against the inner sides of thetubes and expand the same circumferentially, so as to fit tightly in the hole provided for it in the fluesheet.

The invention consists in an improved construction and combination of the head or body of the expander with the expandingrollers and certain devices for retaining the rollers in the supporting-body, and also in novel devices connected with theroller-supporting head for supporting the latter on the exterior of the flue-sheet, so as to preventsaid head from pressing against the end of the tube; and it also consists in other peculiarities of the details of the expander, all tending to render the tool more convenient and efficient in its operation.

In the accompanying drawings, Figure 1 is a side view of our improved tube-expander. Fig. 2 is a longitudinal section through the center ofthe expander-body. Fig. 3 is a trans verse section on line x 00, Fig. 1. Fig. 4 is a detached view of one of the bolts by which the expanding-rollers are retained in the head, and Fig. 5 is a sectional view of the device by which the body is supported on the flue-sheet during the operation of the expander.

Similar letters of reference indicate corresponding parts throughout the several views.

A represents the head or body of the expander, said body being composed of a rigid block ofcast-steel orother suitable metal, and formed with an axial eye, a, and radial slots d (1, extending from the eye part way toward the periphery of the body; and in the longitudinal central portion of each of said slots,

and parallel therewith, is formed a way, a, which is extended completely through to the periphery of the body, and is of uniform size and shape from its outer end part way inward, and formed with inward projections, s, which serve to stop the excessive inward movement of a bolt, b, which is introduced into the way a from the outer end thereof, and is provided with shoulders c c, by which it encounters the projections s s, and is thus prevented from entering the central eye, a, and dropping out of the body when the mandrel is withdrawn therefrom.

r 1' denote the expanding-rollers, which are formed with spindles e e, passing through the slots d d of the body A and through the eyes Z Z, extending transversely through the bolts 1) Z). The interior of each eye I is formed flaring toward opposite ends of the eye, so as to allow the tube-expanding end of the roller 2' to yield to a certain degree laterally when encountering projections on the inner surface of the fine to be expanded. The rollers are formed with shoulders t t, by which they abut against the face of the body or head A, and the spindles e e of the rollers protrude at the back of the aforesaid head, and are screw-threaded and provided with nuts 14 and jam-nutsu to retain the rollers in the head A. In order to allow the rollers to freely turn on the head A, we interpose between the nuts to and back of the head A rotatable disks or washers o v.

D represents the usual tapering mandrel or spindle, which, in the operation of the expander, is inserted into the eye a of the head A, and after the rollers r rare introduced into the end of the tube to be expanded and the head A brought to rest against the flue-sheet the aforesaid spindle is forced inward to crowd the rollers rr laterally against the interior of the tube, and simultaneously with the inward pressure of the mandrel it is turned and by its frictional contact with the rollers it imparts rotary motion to the latter, and thereby expands the end portion of the tube, so as to cause it to tightly fit the hole provided for it in the flue-sheet.

In order to prevent the body A from pressing on the protruding end, and thus guard against the splitting of the tube incident to said pressure, and also to relieve the aforesaid body from undue friction, we connect to the face of the body A guards, which project from said face and are adapted to bear on the exterior of the flue-sheet near the end of the due to be expanded. Said guard we prefer to form of rollersff, pivoted on lugs f f, which are movably seated in radial grooves ii in the face of the body A,and are adj ustably securedin their positions by screws passing through the lugs and through radial slots 9 g in the body A, and provided on their ends with nuts by which to tighten said screws with the lugs on the head A, as shown in Fig. 5 of the drawings. The grooves and slots 9 9 allow the lugs to be set a greater or less distance from the center of the body, according to the size of the tube to be expanded.

WILLIAM H. TEBEAU. MARSHALL N. DE LONG.

In presence of- J AGOB F. BENTZ, WM. 0. RAYMOND. 

